Cod. +030220151 - Rel. 2.1 - 04/09/98
39
ALARMS AND TROUBLESHOOTING
Defective or incorrect operation
Equipment in the Infrared range are able to signal most incorrect operation automatically. When any
malfunction occurs the microprocessor initiates the following actions:
• the malfunction is signalled on the display with an appropriate alarm signal. More specifically, the
display shows alternatively the alarm code and the temperature read by the sensor. If more than one alarm
occurs at the same time, they are signalled successively.
• For some alarms an internal buzzer, if fitted, gives an audible warning.
• For these alarms, the AUX relay, where fitted and if configured as an alarm output, will operate.
By pressing the button the buzzer will stop and the relay disconnect, while the alarm code will
disappear only when the cause has been eliminated. The alarm codes are listed in the table below:
ALARM CODE BUZZER AND AUX
RELAY
CAUSE MODELS APPLICABLE
E0 active control sensor error ALL
E1 inactive defrost sensor error IR32Y, IR32C, IRDRC, IR32P
AL active immediate external alarm ALL, if external alarm connected
Ad active delayed external alarm ALL, if external alarm connected
L0 active low temperature alarm ALL
HL active high temperature alarm ALL
EA, EE, Eb inactive data memorisation error ALL
Ed inactive defrost end by time-out IR32Y, IR32C, iRDRC, IR32P
dF inactive defrost in progress ALL
Description of the main alarm signals
FLASHING LED
Initiation of the relative function is delayed for a period while awaiting an external consent or while held up
by another process still in progress. For example, if a defrost is requested during continuous cycle operation,
the defrost will be held up until the continuous cycle is complete, and the appropriate LED (Def) will flash.
E0 FLASHING: control sensor error
• sensor not working because the signal has been interrupted or there is a short-circuit
• sensor not compatible with the equipment
• parameter /0 does not correspond to unit's hardware set-up.
E1 FLASHING: evaporator sensor error
• Sensor not working because the signal interrupted or there is a short circuit
• sensor not compatible with the equipment
• parameter /0 does not correspond to unit's hardware set-up.
AI FLASHING: immediate Multi-function digital input
• check Multi-function input and parameter A4.
Ad FLASHING: delayed Multi-function digital input
• Check Multi-function input and parameters A4 and A7.
LO FLASHING: low temperature alarm.
The sensor has registered a temperature further below the set value than the value given to parameter AL.
• Check parameters AL, Ad and A0.
The alarm will cease as soon as the temperature returns within the limits selected (see parameter AL).
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